I have a similar problem.
Because I am impatient, my laptop touchpad settings are set on nearly full acceleration, but then I sometimes find that the pointer (cursor) overshoots the destination I have in mind. Which is annoying.
I have therefore set the Shift key to act as a damper. This is easily done in the standard touchpad settings. If you are moving the cursor and then you hold down the Shift key, the mouse/pointer slows down to a crawl.Results:
No more overshoots.
More precise pointing.
I suppose you could modify the mouse settings to improve on this, using an AHK script. The script could sense when the pointer was approaching a specific area (co-ordinates), and then AHK would send a Shift-key to the keyboard buffer, thus slowing down the pointer. Something like that, anyway. I would use it.